Bump nodemon from 3.1.0 to 3.1.3 in /backend

Bumps [nodemon](https://github.com/remy/nodemon) from 3.1.0 to 3.1.3.
- [Release notes](https://github.com/remy/nodemon/releases)
- [Commits](remy/nodemon@v3.1.0...v3.1.3)

---
updated-dependencies:
- dependency-name: nodemon
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

backend/package-lock.json

@@ -35,6 +35,6 @@
     "eslint": "^8.57.0",
     "eslint-config-airbnb-base": "^15.0.0",
     "eslint-plugin-import": "^2.29.1",
-    "nodemon": "^3.1.0"
+    "nodemon": "^3.1.3"
   }
 }